Fix blank images #40
Description
https://forums.adafruit.com/viewtopic.php?f=60&t=185642#p901132 reports blank images. This is due to OnDiskBitmap being given an open file instead of a filename
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https://forums.adafruit.com/viewtopic.php?f=60&t=185642#p901132 reports blank images. This is due to OnDiskBitmap being given an open file instead of a filename